Facebook Interest Targeting Expansion is when Facebook gives us the option to expand your target audience if we think doing so will get you better results. It allows us to adjust your interest categories to reach more people who wouldn’t otherwise have been in your target audience. The additional people are ones that Facebook recommends (kind of like a lookalike audience). We typically only use it when we are running a campaign and there aren’t enough impressions available in the categories we’ve selected, as an alternative to having to widen the geographic area.
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